(13)
 Do the PTU Leakage Check for the Left Hydraulic System (Fig. 612).

 S 796-407

 (14)
 Do the Internal Leakage Check for the Left Hydraulic System -Flap/Slat (Fig. 613).

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757
MAINTENANCE MANUAL

 S 796-404
 (15)
 Do the Internal Leakage Check for the Left Hydraulic System - Yaw Damper and Autopilot (Fig. 614).

 S 796-405

 (16)
 Do the Internal Leakage Check for the Left Hydraulic System -Lateral Flight Controls (Fig. 615).

 S 796-406

 (17)
 Do the Internal Leakage Check for the Left Hydraulic System -Empennage Flight Controls (Fig. 616).

 S 976-330

 (18)
 Left System Leakage Summary Sheet

 (a)  These are the conditions which you can use to make a decision about which components to replace. 1) If the leakage flow value of a rudder PCA is 2.0 GPM or
 more, you must replace the PCA. 2) If the leakage flow valve of an elevator PCA is 1.0 GPM or more, you must replace the PCA.
 3)  If the total NULL leakage is more than 4.5 GPM, you must replace the PCAs with high leakage until the total NULL leakage is less than 4.5 GPM.
 (b)  Use the summary sheet as follows:
 1)  For each component on the summary sheet, find the leakage flow value on the figure and step number shown below the component name.
 2)  Write the leakage flow values on the summary sheet opposite the component name as follows: a) If the leakage flow value is zero or a negative value,
 write the value in the SEAL column. b) If the leakage flow value is a positive value, write the value in the NULL column. 3) Add the leakage flow values in the SEAL column and write the result in the space for the SEAL total.
 4)  If the SEAL total leakage or the NULL total leakage (Flow No. Fig. 615 Step 7) is 4.5 GPM or more, replace components with high leakage as necessary to decrease this leakage to less than 4.5 GPM.
 (c)  Left Leakage Summary Sheet ~............................................................
 |  Total Left System "Null" Leakage  |
 |  [Flow No. Fig. 615 Step 7]  ______ GPM |
 |  |
 |  Yaw Damper and Autopilot  "NULL"  |
 |  ------------------------ |
 |  (Pos.)  |
　
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